Now playing
02:32
Scott Pruitt tries to soothe worries at EPA
Now playing
02:46
EPA chief Scott Pruitt resigns
trump-firing-resignations-removals-2018-orig-mg_00000615.jpg
trump-firing-resignations-removals-2018-orig-mg_00000615.jpg
Now playing
02:50
Trump administration's big exits in 2018
EAST CHICAGO, IN - APRIL 19:  U.S. EPA Administrator Scott Pruitt makes a statement to the media after meeting residents from and taking a brief tour of the West Calumet Housing Complex on April 19, 2017 in East Chicago, Indiana.  Nearly all the residents of the complex were ordered to move by the East Chicago Housing Authority after the soil and many homes in the complex were found to contain high levels of lead. The area has been declared an EPA superfund site. This was Pruitt's first visit to a superfund site since being named the agency's administrator. The complex is scheduled for demolition.  (Photo by Scott Olson/Getty Images)
Scott Olson/Getty Images
EAST CHICAGO, IN - APRIL 19: U.S. EPA Administrator Scott Pruitt makes a statement to the media after meeting residents from and taking a brief tour of the West Calumet Housing Complex on April 19, 2017 in East Chicago, Indiana. Nearly all the residents of the complex were ordered to move by the East Chicago Housing Authority after the soil and many homes in the complex were found to contain high levels of lead. The area has been declared an EPA superfund site. This was Pruitt's first visit to a superfund site since being named the agency's administrator. The complex is scheduled for demolition. (Photo by Scott Olson/Getty Images)
Now playing
01:44
Lawmakers want probe of Pruitt's secret calendar
WASHINGTON, DC - JANUARY 18: Oklahoma Attorney General Scott Pruitt, President-elect Donald Trump's choice to head the Environmental Protection Agency, testifies during his confirmation hearing before the Senate Committee on Environment and Public Works on Capitol Hill January 18, 2017 in Washington, DC. Pruitt is expected to face tough questioning about his stance on climate change and ties to the oil and gas industry.   (Photo by Aaron P. Bernstein/Getty Images)
Aaron P. Bernstein/Getty Images
WASHINGTON, DC - JANUARY 18: Oklahoma Attorney General Scott Pruitt, President-elect Donald Trump's choice to head the Environmental Protection Agency, testifies during his confirmation hearing before the Senate Committee on Environment and Public Works on Capitol Hill January 18, 2017 in Washington, DC. Pruitt is expected to face tough questioning about his stance on climate change and ties to the oil and gas industry. (Photo by Aaron P. Bernstein/Getty Images)
Now playing
02:19
Why Scott Pruitt may be getting a pass
Now playing
02:39
Pruitt appealed to Trump to get Sessions' job
EAST CHICAGO, IN - APRIL 19:  U.S. EPA Administrator Scott Pruitt makes a statement to the media after meeting residents from and taking a brief tour of the West Calumet Housing Complex on April 19, 2017 in East Chicago, Indiana.  Nearly all the residents of the complex were ordered to move by the East Chicago Housing Authority after the soil and many homes in the complex were found to contain high levels of lead. The area has been declared an EPA superfund site. This was Pruitt's first visit to a superfund site since being named the agency's administrator. The complex is scheduled for demolition.  (Photo by Scott Olson/Getty Images)
Scott Olson/Getty Images
EAST CHICAGO, IN - APRIL 19: U.S. EPA Administrator Scott Pruitt makes a statement to the media after meeting residents from and taking a brief tour of the West Calumet Housing Complex on April 19, 2017 in East Chicago, Indiana. Nearly all the residents of the complex were ordered to move by the East Chicago Housing Authority after the soil and many homes in the complex were found to contain high levels of lead. The area has been declared an EPA superfund site. This was Pruitt's first visit to a superfund site since being named the agency's administrator. The complex is scheduled for demolition. (Photo by Scott Olson/Getty Images)
Now playing
01:56
Conservatives turn on embattled EPA chief
In this May 16, 2018, photo, Environmental Protection Agency Administrator Scott Pruitt appears before a Senate Appropriations subcommittee on the Interior, Environment, and Related Agencies on budget on Capitol Hill in Washington. Pruitt claimed credit for pollution cleanups done mostly by the Obama administration while flubbing facts about his 2017 condo deal and blaming underlings for his ethical woes. (AP Photo/Andrew Harnik)
Andrew Harnik/AP
In this May 16, 2018, photo, Environmental Protection Agency Administrator Scott Pruitt appears before a Senate Appropriations subcommittee on the Interior, Environment, and Related Agencies on budget on Capitol Hill in Washington. Pruitt claimed credit for pollution cleanups done mostly by the Obama administration while flubbing facts about his 2017 condo deal and blaming underlings for his ethical woes. (AP Photo/Andrew Harnik)
Now playing
02:11
WaPo: Pruitt enlisted aide to get wife a job
Now playing
01:14
Pruitt interrupted by protester holding lotion
WASHINGTON, DC - MAY 16:  EPA Administrator Scott Pruitt, testifies during a Senate Appropriations Subcommittee hearing on Capitol Hill, May 16, 2018 in Washington, DC. The Subcommittee is hearing testimony on the proposed budget estimates for FY2019 for the Environmental Protection Agency.  (Photo by Mark Wilson/Getty Images)
Mark Wilson/Getty Images North America/Getty Images
WASHINGTON, DC - MAY 16: EPA Administrator Scott Pruitt, testifies during a Senate Appropriations Subcommittee hearing on Capitol Hill, May 16, 2018 in Washington, DC. The Subcommittee is hearing testimony on the proposed budget estimates for FY2019 for the Environmental Protection Agency. (Photo by Mark Wilson/Getty Images)
Now playing
02:43
Dems ask FBI to investigate Scott Pruitt
Environmental Protection Agency (EPA) Administrator Scott Pruitt testifies about the fiscal year 2018 budget during a Senate Appropriations Subcommittee on Interior, Environment, and Related Agencies hearing on Capitol Hill in Washington, DC, June 27, 2017. / AFP PHOTO / SAUL LOEB        (Photo credit should read SAUL LOEB/AFP/Getty Images)
SAUL LOEB/AFP/Getty Images
Environmental Protection Agency (EPA) Administrator Scott Pruitt testifies about the fiscal year 2018 budget during a Senate Appropriations Subcommittee on Interior, Environment, and Related Agencies hearing on Capitol Hill in Washington, DC, June 27, 2017. / AFP PHOTO / SAUL LOEB (Photo credit should read SAUL LOEB/AFP/Getty Images)
Now playing
01:23
WaPo: Pruitt used EPA aide to help wife
WASHINGTON, DC - DECEMBER 7:  Environmental Protection Agency Administrator Scott Pruitt testifies before the House Energy and Commerce Committee about the mission of the U.S. Environmental Protection Agency on December 7, 2017 in Washington, DC.  (Photo by Pete Marovich/Getty Images)
Pete Marovich/Getty Images/FILE
WASHINGTON, DC - DECEMBER 7: Environmental Protection Agency Administrator Scott Pruitt testifies before the House Energy and Commerce Committee about the mission of the U.S. Environmental Protection Agency on December 7, 2017 in Washington, DC. (Photo by Pete Marovich/Getty Images)
Now playing
02:06
EPA spent nearly $3.5M on security for Pruitt
EPA Administrator Scott Pruitt testifies before the House Appropriations Committee during a hearing on the 2019 Fiscal Year EPA budget at the Capitol on April 26, 2018 in Washington, DC. (Alex Edelman/Getty Images)
Alex Edelman/Getty Images
EPA Administrator Scott Pruitt testifies before the House Appropriations Committee during a hearing on the 2019 Fiscal Year EPA budget at the Capitol on April 26, 2018 in Washington, DC. (Alex Edelman/Getty Images)
Now playing
01:52
Aide sought used Trump hotel mattress for Pruitt
WASHINGTON, DC - JANUARY 18: Oklahoma Attorney General Scott Pruitt, President-elect Donald Trump's choice to head the Environmental Protection Agency, testifies during his confirmation hearing before the Senate Committee on Environment and Public Works on Capitol Hill January 18, 2017 in Washington, DC. Pruitt is expected to face tough questioning about his stance on climate change and ties to the oil and gas industry.   (Photo by Aaron P. Bernstein/Getty Images)
Aaron P. Bernstein/Getty Images
WASHINGTON, DC - JANUARY 18: Oklahoma Attorney General Scott Pruitt, President-elect Donald Trump's choice to head the Environmental Protection Agency, testifies during his confirmation hearing before the Senate Committee on Environment and Public Works on Capitol Hill January 18, 2017 in Washington, DC. Pruitt is expected to face tough questioning about his stance on climate change and ties to the oil and gas industry. (Photo by Aaron P. Bernstein/Getty Images)
Now playing
02:40
Pruitt target of at least 11 federal probes
 Environmental Protection Agency Administrator Scott Pruitt testifies before the House Energy and Commerce Committee's Environment Subcommittee in the Rayburn House Office Building on Capitol Hill April 26, 2018 in Washington, DC. (Chip Somodevilla/Getty Images)
Chip Somodevilla/Getty Images
Environmental Protection Agency Administrator Scott Pruitt testifies before the House Energy and Commerce Committee's Environment Subcommittee in the Rayburn House Office Building on Capitol Hill April 26, 2018 in Washington, DC. (Chip Somodevilla/Getty Images)
Now playing
02:54
EPA's embattled Pruitt grilled on Capitol Hill
WASHINGTON, DC - NOVEMBER 17:  Environmental Protection Agency Administrator Scott Pruitt leaves after he spoke at an event November 17, 2017 in Washington, DC. Pruitt addressed The Federalist Society's 2017 National Lawyers Convention at the Mayflower Hotel.  (Photo by Alex Wong/Getty Images)
Alex Wong/Getty Images
WASHINGTON, DC - NOVEMBER 17: Environmental Protection Agency Administrator Scott Pruitt leaves after he spoke at an event November 17, 2017 in Washington, DC. Pruitt addressed The Federalist Society's 2017 National Lawyers Convention at the Mayflower Hotel. (Photo by Alex Wong/Getty Images)
Now playing
02:57
Republicans wants answers from EPA chief

Story highlights

A letter signed by Pruitt was nearly identical to one sent by a Devon Energy lobbyist

More than 7,500 pages of emails shed light on Pruitt's relationship with the energy company

(CNN) —  

In June 2013, a top lobbyist at Devon Energy, an Oklahoma-based oil and natural gas giant, sent one of Oklahoma Attorney General Scott Pruitt’s top officials a draft letter objecting to recently proposed federal regulations on fracking.

Two months later, Pruitt, who is now the head of the Environmental Protection Agency under President Donald Trump, signed a nearly identical version of that letter and sent it to then-Interior Secretary Sally Jewell. The only difference was the addition of the attorney general’s official letterhead and a paragraph citing additional legal precedent to back up the letter’s arguments against federal regulations on hydraulic fracturing, or fracking, one of the main ways Devon Energy pumps out oil and natural gas.

The episode was just one of several examples that highlighted the relationship Pruitt and his top aides maintained with Devon Energy and the oil and gas industry during his time as Oklahoma attorney general. This raises fresh questions about how Pruitt will conduct himself at the EPA, which is charged with regulating that industry.

More than 7,500 pages of emails from the Oklahoma attorney general’s office obtained and released by the Center for Media and Democracy through an open records request shed light on Pruitt’s relationship with Devon Energy, including allowing the energy giant’s top lobbyists to draft and edit letters sent to top federal officials on behalf of Pruitt and other state attorneys general.

A CNN request for comment from the White House was not immediately returned.

An EPA spokesman said the agency would not be commenting.

“That’s an Oklahoma issue and we are going to remain focused on the environment and environmental issues,” EPA spokesman Doug Ericksen said.

CNN has also reached out for comment to the four state attorney generals who co-signed the August 2013 letter to ask if they were aware the letter had been drafted by Devon Energy officials.

More than 7,500 pages of emails from the Oklahoma attorney general’s office obtained and released by the Center for Media and Democracy through an Open Records Act shed light on Pruitt’s relationship with Devon Energy, including allowing the energy giant’s top lobbyists to draft and edit letters sent on Pruitt and other state attorney generals’ behalf to top federal officials.

The newly released emails confirm years of cushy ties between Pruitt and Devon Energy dating back to at least October 2011, when Pruitt also signed a letter quietly drafted by Devon Energy officials and sent it to the head of the EPA. That exchange was first reported by The New York Times in December 2014.

That type of exchange took place multiple times in years to come, according to the released emails.

A month before one of Devon Energy’s top lobbyists sent the draft letter on fracking to Pruitt’s deputy solicitor general Clayton Eubanks, Eubanks gave Devon Energy officials the opportunity to edit a separate letter addressed to the EPA – this time about the regulation of methane emissions, a dangerous pollutant.

“Attached is the final draft of the methane letter to EPA regarding the 7 NE States NOI to sue over the regulation of methane emissions. We have received good support on this and I would like to get the letter out in the morning. I thought we should insert a sentence or two regarding the recent EPA report indicating their initial estimates on methane emissions for two categories were too high,” Eubanks wrote in a May 2013 email to Bill Whitsitt, Devon’s executive vice president of public affairs. “Any suggestions?”

Less than three hours later, Whitsitt replied with proposed additions to the letter from him and his team.

The next day, Pruitt sent the letter that included Whitsitt’s changes, word-for-word.

At the time, Devon Energy had been leading the fight against the EPA’s system of measuring methane emissions.

“There’s no mention of Pruitt questioning anything they (the energy industry) are doing or saying. This is a direct cut and paste type relationship,” said Liz Perera, the Sierra Club’s climate policy director, who said the emails make clear Pruitt “not only has a good relationship [with the] fossil fuel industry but he’s dependent on them to provide research and talking points.”

Perera said she was especially struck by the absence of any mention of the earthquakes occurring in Oklahoma at the time, which scientists believed to be tied to fracking activity in the state.

“Pruitt never expressed concern about the increased number of earthquakes believed to be linked to the fracking activity in Oklahoma. He never mentioned launching an investigation into the earthquakes,” Perera said.

Hundreds of other emails showed regular contact between Pruitt’s top aides and Devon Energy’s lobbyists and public affairs executives, including frequent phone calls and in-person meetings between those officials – as well as meetings between Pruitt and Whitsitt.

Whitsitt also sent along talking points and other draft letters to Pruitt’s office in 2013 following “conversations with Attorney General Pruitt.”

CNN could not immediately confirm whether Pruitt officially used those letters and talking points as well.

The emails also showed that Pruitt was close with other groups beyond Devon Energy.

In a May 2013 email, Pruitt’s executive assistant emailed Richard Moskowitz, the general counsel of the American Fuel & Petrochemical Manufacturers association, after “General Pruitt asked that I email you” to put Moskowitz in touch with Eubanks, Oklahoma’s deputy solicitor general.

“Thank you again for the information you provided during General Pruitt’s visit and please do not hesitate to contact me if there is anything else we can do for you,” Pruitt’s assistant wrote in the email.

Some conservative groups are defending Pruitt’s close relationship with the industry. “Despite hyperventilating from fringe groups on the left, these emails show that Scott Pruitt was a dutiful and responsible Attorney General who fought daily on behalf of the people that elected him,” Jeremy Adler of America Rising Squared told CNN. “There was no new information in these emails to support the left’s anti-Pruitt fever dreams, instead they showed that he behaved like any accomplished public servant, working with key industries in his state to help his constituents.”

CNN’s Amanda Watts and Curt Devine contributed to this report.